They do an excellent job. Probably the best car wash I've ever had except for the shiny, waxy stuff they put all over my dash and plastic interior. Smells funny and the sun reflects off it into my window which is distracting. Next time I'll know to request they not put it on.
I would NOT recommend getting the Yelp deal. I did and when I gave it to the cashier, neither she nor anyone else at the car wash knew what to do with it or had heard of the "Yelp" deal before. They had to call their boss at a funeral to find out what to do with it, which I felt guilty for and subsequently I spent an extra 10 minutes there waiting for them to figure it out.